Sash-lock.



Patented Apr. I, I9Ul'2.

D. HOYT. SASH LOCK.

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'Application led Jan. 2, 1902.)

(N0 Modl.)

wlTNessEsf Nrrnn raras artnr ferien@ DANIEL IIOYT, OF SOUTH NORWALK, CONNECTICUT, ASSIGNOR OF ONE- I'IALF TO THE NATIONAL LOOK WASHER COMPANY, OF NEWARK, NEYV JERSEY, A CORPORATION OF NEW JERSEY.

SPECIFICATION forming part of Letters Patent No. 696,819, dated April 1, 1902.

Application filed January 2, 1902. Serial No. 88,175. (No model.)

To @ZZ whom t may concern:

Beit known that I, DANIEL HOYT, a citizen of the United States, residing at South Norwalk, county of Fairfield, State of Connecticut, have invented a new and useful Sash- Lock, of which the followingis a specification.

My invention relates to the class of sashlocks in which the sash is held in any desired position, either closed or open, more or less, by the engagement with a rack upon the casing or bead of toothed locking-cams held in engagement therewith by a spring; and my invention has for its object to simplify and cheapen the construction and to greatly improve the mode of operation in use. "With these ends in view l have devised the simple and novel locking mechanism which I will now describe, referring to the accompanying drawings, forming part of this specification, and using reference characters to designate the several parts.

Figure l is a view showing my novel lock in elevation, the casing being in vertical section and the sash being locked in a partlyraised position; Fig. 2, a section of the sash on the line 2 2 in Fig. 1; Fig. 3, aview of the lock detached and reversed and the back plate removed, the position of the upper lockingcam and lever when operated alone being indicated by dotted lines; and Fig. 4 is a view of the back plate detached.

10 denotes the casing; 1l, the sash; 12, the lock-case, and 13 theback plate thereof. The casing is provided with a rack 14E, having teeth l5, whose sides incline from the apex at a slightly obtuse angle. The locking mechanism comprises two eccentric locking-cams 16, pivot-ed on posts 17 in the case and provided with rearwardly-extending operatinglevers 18 and with teeth 19, correspondin g substantially in shape with the teeth of the rackthat is, inclining in opposite directions from the apex, the sides lying at a slightly obtuse angle to each other. These operating-cams are retained in the locking position by a spring or springs, preferably a bow-spring 20, whose ends engage the levers, as clearly shown.

It has been demonstrated by practical use of this class of sash-locks, especially upon carwindows, that it is necessary to provide such a construction and arrangement of parts that the locking-cams may be operated together by inward pressure upon both levers; that both locking-cams be operated bya lifting movement upon the lower lever and without the necessity of operating the upper lever; that in order to prevent the sash from being violently closed the parts be so constructed and arranged that movement of the upper lever alone will not unlock the sash, which will remain locked until the lower lever is operated by a lifting movement, and that the parts be so constructed and arranged that should the spring break when the sash is raised the sash will not fall, but will remain locked until the lower lever is operated by a lifting movement, it being of course immaterial so far as the principle of my invention is concerned whether locks are used upon opposite sides of the sash or upon one side only. I accomplish the desired result by providing the lower locking-cam with an operating-cam 21 and the upper locking-cam with an operating-cam 22, lying in front of and in engagement with operating-cam 21, these operating-cams being so laid out and proportioned to each other as to engage with a rolling contact, so that any lifting movement applied to the lower lever to detach the lower locking-cam from the rack will, through the engagement of the operating-cams, operate the upper locking-cam simultaneously and disengage said upper locking-cam from the rack, so that the sash may be raised and lowered with perfect freedom and will remain locked in any position in which it may be placed by relieving the pressure upon the lower lever. It will be noted, however, (see Fig. 3,) that operation-that is, a downward pull upon the upper lever-will merely disengage the upper locking-cam from the rack, but will have no effect whatever upon the lower locking-cam, leaving said lower locking-cam firmly engaged with the rack, in which position it will remain until the lower locking-cam is operated by a lifting movement. I provide this construction in order to prevent the sash from being violently closed by a downward pull upon the upper lever. As the sash cannot be unlocked with- ICO out upward movement of the lower lever, it follows that the operator will necessarily retain control of the sash, and thus prevent its being violently closed when disengaged from the rack. This construction secures the additional advantage that the sash will not drop should the spring break while :it is raised. The breaking of the spring would of course permit the upper lever to drop by gravity and throw the upper locking-cam out of engagement with the rack. Gravity, however, would also act to retain the lower lever de pressed and would thus retain the lower locking-cam in engagement with the rack, so that the sash could not fall.

The operation will be obvious from the drawings. To raise the sash, the operator presses inward upon the operating-levers or, if preferred, lifts the lower lever only, which disengages the locking-cams from the rack, leaving the sash free to be raised. The sash is locked, as already stated, in any desired position by merely relieving the pressure upon the levers, the spring acting to throw both locking-cams into engagement with the rack, 0r should the spring be broken gravity acting to throw the lower locking-cam into engagement with the rack, the shape of the teeth (slightly obtuse angles) being such that either or bot-h locking-cams will lock the sash in any position. To close the sash, it is required that the lower lever be operated by a lifting movement, which disengages the locking-cams from the rack, leaving the sash at the control of the operator and preventing the sash from being violently closed, as the entire weight will be upon the lower operating-lever which is held by the operator.

Having thus described. my invention, I claim- A sash-lock comprising upper and lower eccentric locking-cams having rearwardly-extending operating-levers, said locking-cams being provided with contacting operatingcams, the operating-cam upon the upper locking-cam lying in front of the operating-cam upon the lower locking-cam, so that upward movement of the lower lever will disengage both locking-cams but downward movement of the upper lever will only disengage the upper locking-cam leaving the lower lockingcam in the locking position.

In testimony whereof I affix my signature in presence of two witnesses.

DANIEL HOYT.

Vitnesses:

A. M. WoosTER, S. W. ATHERTON. 

